// Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2017 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

#include "dropout.h"

namespace ncnn {

    DEFINE_LAYER_CREATOR(Dropout)

    Dropout::Dropout() {
        one_blob_only = true;
        support_inplace = true;
    }

    int Dropout::load_param(const ParamDict &pd) {
        scale = pd.get(0, 1.f);

        return 0;
    }

    int Dropout::forward_inplace(Mat &bottom_top_blob) const {
        if (scale == 1.f) {
            return 0;
        }

        int w = bottom_top_blob.w;
        int h = bottom_top_blob.h;
        int channels = bottom_top_blob.c;
        int size = w * h;

#pragma omp parallel for
        for (int q = 0; q < channels; q++) {
            float *ptr = bottom_top_blob.channel(q);

            for (int i = 0; i < size; i++) {
                ptr[i] = ptr[i] * scale;
            }
        }

        return 0;
    }

} // namespace ncnn
